C[ruise Control

[omega1940]

I have an 1988, 4+3. My cruise control has failed. I believe I read that on possible problem was the vacuum damper valve leaking or not functioning.

I located the valve by following the vacuun hose from the cruise control servo to the valve. The black plastic valve has three vacuum tube connections. One comes from the cruise servo, and one comes out of the right rear of the plenium near the fuel pressure regulator. I bought a new valve anf when I started to attach the vacuum lines I could not locate the third vacuum line.

I have searched everywhere around the distrbutor and simply cannot find the hose. My Haines manual does not show any diagram if this damper valve.

If anyone has replaced this valve I would appreciate some help. I believe the line ftom the cruise control tube connects to the valve on the "L" shaped outlets on the bottom of the valve. The vacuum line from the plenium goes to the top outlet pipe. The 3rd outlet is the one I can't locate.

Also, any other trouble shooting ideas wolud be of great help
as well.

Thanks,

Mike Haselmire

 

[SPANISHVETTS]

Here is a quick test to find the problem. Pull the vac. lines off of the servo.
1. With the engin running do you have vaccum on the small line coming from the engin-vac canister? Yes, go to the next step, no start looking for a pinched, broken hose.

2. Suck on the large hose that goes back into the dash area. Does it hold a vaccum? I`ll bet it does not.

Odds are that the problem is the brake switch. It is a cheap plastic part that backs out of its nylon nut far enough that the switch is always open.

To get to it you remove the hush panel and crawl on your back under the dash. The brake has 2 switches the one you want is the bigger one with the black vac. tube connected to it. wiggle and jiggle it untill it goes back through the nut and the switch is engaged by the brake.

Now since you do not want to crawl into that cave again wrap a plastic wire tie around the switch and the mounting bracket. Pull it up tight so that the switch can not work it way out again, replace the hush panel.

Have yourself surgically extracted from the car and spend the money you saved on a Chiropractor.

If both of the above test prove ok your problem is electric you will need the service manual. I have driven GM products with cruise since 1973 and all of the cruise problems have been with that stupid switch.

 

[vigman]

I agree with spanish!

Try that first!

#2 problem is the switch on the turn signal stalk!


Vig!